F1 Glossary · tires
Intermediate Tires
Intermediate tires are grooved racing tires used when a track is damp or light rain is falling, sitting between slick and wet tires.
The Versatile Middle Ground
Intermediate tires, identifiable by their green sidewall markings, are the most versatile tires in a Formula 1 team's arsenal. Unlike slick tires, which have no tread to maximize contact with dry asphalt, intermediates feature a shallow tread pattern designed to displace water while maintaining a large enough contact patch for grip. They are specifically engineered to handle light standing water on the track surface without the car hydroplaning, yet they are firm enough to provide stability as the racing line begins to dry.
The Crossover Window
The most critical aspect of intermediate tires is the "crossover window." This is the point in a race where the track conditions change enough that one tire type becomes faster than another. If a track is too wet for slicks but not flooded enough to require the deep grooves of full wet tires (blue sidewalls), the intermediate is the optimal choice. Strategic success often hinges on a team’s ability to predict this window, as switching too early or too late can cost several seconds per lap.
Real-World Performance
A notable example of intermediate tire management occurred at the 2021 Turkish Grand Prix. Esteban Ocon completed the entire race on a single set of intermediates, a rare feat that demonstrated the tire's durability in consistently damp conditions. Conversely, the 2023 Dutch Grand Prix saw multiple transitions between slicks and intermediates as rain showers moved across the Zandvoort circuit, forcing teams to make split-second pit wall decisions to stay competitive.
Common Viewer Confusion
Fans often wonder why drivers don't stay on intermediates as the track dries completely. While they provide grip on a damp surface, the rubber compound is much softer than dry-weather slicks. On a dry track, the tread blocks "squirm" and generate excessive heat, causing the tire to degrade or "grain" almost immediately. Once the racing line turns dark and dry, the intermediate tire quickly loses its performance advantage compared to a slick tire.
Common questions
- How much water can intermediate tires displace?
- At full speed, a set of intermediate tires can displace approximately 30 liters of water per second. This prevents the car from hydroplaning on damp surfaces.
- How do you tell the difference between intermediate and wet tires?
- Intermediate tires feature green branding on the sidewalls and shallower grooves. Full wet tires have blue branding and much deeper, wider tread patterns designed for heavy rain and standing water.
- What happens if a driver uses intermediates on a dry track?
- The soft rubber and tread blocks will overheat rapidly. This leads to blistering or graining, where the tire surface breaks apart, significantly reducing grip and causing the tire to fail much faster than intended.
- Is there a limit to how many intermediates a team can use?
- Standard regulations typically allocate four sets of intermediate tires to each driver per race weekend, though the FIA may provide an additional set if Friday practice sessions are held in wet conditions.